The Tor Browser: intl/icu/source/common/util.cpp@fc2d59ddac77 (annotated)

intl/icu/source/common/util.cpp@fc2d59ddac77 (annotated)

intl/icu/source/common/util.cpp

Wed, 31 Dec 2014 07:22:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:22:50 +0100
branch: TOR_BUG_3246
changeset 4: fc2d59ddac77
permissions: -rw-r--r--

Correct previous dual key logic pending first delivery installment.

 /*
 **********************************************************************
 *   Copyright (c) 2001-2011, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 **********************************************************************
 *   Date        Name        Description
 *   11/19/2001  aliu        Creation.
 **********************************************************************
 */
 #include "unicode/unimatch.h"
 #include "unicode/utf16.h"
 #include "patternprops.h"
 #include "util.h"
 // Define UChar constants using hex for EBCDIC compatibility
 static const UChar BACKSLASH  = 0x005C; /*\*/
 static const UChar UPPER_U    = 0x0055; /*U*/
 static const UChar LOWER_U    = 0x0075; /*u*/
 static const UChar APOSTROPHE = 0x0027; // '\''
 static const UChar SPACE      = 0x0020; // ' '
 // "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 static const UChar DIGITS[] = {
 ,49,50,51,52,53,54,55,56,57,
 ,66,67,68,69,70,71,72,73,74,
 ,76,77,78,79,80,81,82,83,84,
 ,86,87,88,89,90
 };
 U_NAMESPACE_BEGIN
 UnicodeString& ICU_Utility::appendNumber(UnicodeString& result, int32_t n,
                                      int32_t radix, int32_t minDigits) {
     if (radix < 2 || radix > 36) {
         // Bogus radix
         return result.append((UChar)63/*?*/);
     }
     // Handle negatives
     if (n < 0) {
         n = -n;
         result.append((UChar)45/*-*/);
     }
     // First determine the number of digits
     int32_t nn = n;
     int32_t r = 1;
     while (nn >= radix) {
         nn /= radix;
         r *= radix;
         --minDigits;
     }
     // Now generate the digits
     while (--minDigits > 0) {
         result.append(DIGITS[0]);
     }
     while (r > 0) {
         int32_t digit = n / r;
         result.append(DIGITS[digit]);
         n -= digit * r;
         r /= radix;
     }
     return result;
 }
 /**
  * Return true if the character is NOT printable ASCII.
  */
 UBool ICU_Utility::isUnprintable(UChar32 c) {
     return !(c >= 0x20 && c <= 0x7E);
 }
 /**
  * Escape unprintable characters using \uxxxx notation for U+0000 to
  * U+FFFF and \Uxxxxxxxx for U+10000 and above.  If the character is
  * printable ASCII, then do nothing and return FALSE.  Otherwise,
  * append the escaped notation and return TRUE.
  */
 UBool ICU_Utility::escapeUnprintable(UnicodeString& result, UChar32 c) {
     if (isUnprintable(c)) {
         result.append(BACKSLASH);
         if (c & ~0xFFFF) {
             result.append(UPPER_U);
             result.append(DIGITS[0xF&(c>>28)]);
             result.append(DIGITS[0xF&(c>>24)]);
             result.append(DIGITS[0xF&(c>>20)]);
             result.append(DIGITS[0xF&(c>>16)]);
         } else {
             result.append(LOWER_U);
         }
         result.append(DIGITS[0xF&(c>>12)]);
         result.append(DIGITS[0xF&(c>>8)]);
         result.append(DIGITS[0xF&(c>>4)]);
         result.append(DIGITS[0xF&c]);
         return TRUE;
     }
     return FALSE;
 }
 /**
  * Returns the index of a character, ignoring quoted text.
  * For example, in the string "abc'hide'h", the 'h' in "hide" will not be
  * found by a search for 'h'.
  */
 // FOR FUTURE USE.  DISABLE FOR NOW for coverage reasons.
 /*
 int32_t ICU_Utility::quotedIndexOf(const UnicodeString& text,
                                int32_t start, int32_t limit,
                                UChar charToFind) {
     for (int32_t i=start; i<limit; ++i) {
         UChar c = text.charAt(i);
         if (c == BACKSLASH) {
             ++i;
         } else if (c == APOSTROPHE) {
             while (++i < limit
                    && text.charAt(i) != APOSTROPHE) {}
         } else if (c == charToFind) {
             return i;
         }
     }
     return -1;
 }
 */
 /**
  * Skip over a sequence of zero or more white space characters at pos.
  * @param advance if true, advance pos to the first non-white-space
  * character at or after pos, or str.length(), if there is none.
  * Otherwise leave pos unchanged.
  * @return the index of the first non-white-space character at or
  * after pos, or str.length(), if there is none.
  */
 int32_t ICU_Utility::skipWhitespace(const UnicodeString& str, int32_t& pos,
                                     UBool advance) {
     int32_t p = pos;
     const UChar* s = str.getBuffer();
     p = (int32_t)(PatternProps::skipWhiteSpace(s + p, str.length() - p) - s);
     if (advance) {
         pos = p;
     }
     return p;
 }
 /**
  * Skip over Pattern_White_Space in a Replaceable.
  * Skipping may be done in the forward or
  * reverse direction.  In either case, the leftmost index will be
  * inclusive, and the rightmost index will be exclusive.  That is,
  * given a range defined as [start, limit), the call
  * skipWhitespace(text, start, limit) will advance start past leading
  * whitespace, whereas the call skipWhitespace(text, limit, start),
  * will back up limit past trailing whitespace.
  * @param text the text to be analyzed
  * @param pos either the start or limit of a range of 'text', to skip
  * leading or trailing whitespace, respectively
  * @param stop either the limit or start of a range of 'text', to skip
  * leading or trailing whitespace, respectively
  * @return the new start or limit, depending on what was passed in to
  * 'pos'
  */
 //?FOR FUTURE USE.  DISABLE FOR NOW for coverage reasons.
 //?int32_t ICU_Utility::skipWhitespace(const Replaceable& text,
 //?                                    int32_t pos, int32_t stop) {
 //?    UChar32 c;
 //?    UBool isForward = (stop >= pos);
 //?
 //?    if (!isForward) {
 //?        --pos; // pos is a limit, so back up by one
 //?    }
 //?
 //?    while (pos != stop &&
 //?           PatternProps::isWhiteSpace(c = text.char32At(pos))) {
 //?        if (isForward) {
 //?            pos += U16_LENGTH(c);
 //?        } else {
 //?            pos -= U16_LENGTH(c);
 //?        }
 //?    }
 //?
 //?    if (!isForward) {
 //?        ++pos; // make pos back into a limit
 //?    }
 //?
 //?    return pos;
 //?}
 /**
  * Parse a single non-whitespace character 'ch', optionally
  * preceded by whitespace.
  * @param id the string to be parsed
  * @param pos INPUT-OUTPUT parameter.  On input, pos[0] is the
  * offset of the first character to be parsed.  On output, pos[0]
  * is the index after the last parsed character.  If the parse
  * fails, pos[0] will be unchanged.
  * @param ch the non-whitespace character to be parsed.
  * @return true if 'ch' is seen preceded by zero or more
  * whitespace characters.
  */
 UBool ICU_Utility::parseChar(const UnicodeString& id, int32_t& pos, UChar ch) {
     int32_t start = pos;
     skipWhitespace(id, pos, TRUE);
     if (pos == id.length() ||
         id.charAt(pos) != ch) {
         pos = start;
         return FALSE;
     }
     ++pos;
     return TRUE;
 }
 /**
  * Parse a pattern string within the given Replaceable and a parsing
  * pattern.  Characters are matched literally and case-sensitively
  * except for the following special characters:
  *
  * ~  zero or more Pattern_White_Space chars
  *
  * If end of pattern is reached with all matches along the way,
  * pos is advanced to the first unparsed index and returned.
  * Otherwise -1 is returned.
  * @param pat pattern that controls parsing
  * @param text text to be parsed, starting at index
  * @param index offset to first character to parse
  * @param limit offset after last character to parse
  * @return index after last parsed character, or -1 on parse failure.
  */
 int32_t ICU_Utility::parsePattern(const UnicodeString& pat,
                                   const Replaceable& text,
                                   int32_t index,
                                   int32_t limit) {
     int32_t ipat = 0;
     // empty pattern matches immediately
     if (ipat == pat.length()) {
         return index;
     }
     UChar32 cpat = pat.char32At(ipat);
     while (index < limit) {
         UChar32 c = text.char32At(index);
         // parse \s*
         if (cpat == 126 /*~*/) {
             if (PatternProps::isWhiteSpace(c)) {
                 index += U16_LENGTH(c);
                 continue;
             } else {
                 if (++ipat == pat.length()) {
                     return index; // success; c unparsed
                 }
                 // fall thru; process c again with next cpat
             }
         }
         // parse literal
         else if (c == cpat) {
             index += U16_LENGTH(c);
             ipat += U16_LENGTH(cpat);
             if (ipat == pat.length()) {
                 return index; // success; c parsed
             }
             // fall thru; get next cpat
         }
         // match failure of literal
         else {
             return -1;
         }
         cpat = pat.char32At(ipat);
     }
     return -1; // text ended before end of pat
 }
 /**
  * Append a character to a rule that is being built up.  To flush
  * the quoteBuf to rule, make one final call with isLiteral == TRUE.
  * If there is no final character, pass in (UChar32)-1 as c.
  * @param rule the string to append the character to
  * @param c the character to append, or (UChar32)-1 if none.
  * @param isLiteral if true, then the given character should not be
  * quoted or escaped.  Usually this means it is a syntactic element
  * such as > or $
  * @param escapeUnprintable if true, then unprintable characters
  * should be escaped using \uxxxx or \Uxxxxxxxx.  These escapes will
  * appear outside of quotes.
  * @param quoteBuf a buffer which is used to build up quoted
  * substrings.  The caller should initially supply an empty buffer,
  * and thereafter should not modify the buffer.  The buffer should be
  * cleared out by, at the end, calling this method with a literal
  * character.
  */
 void ICU_Utility::appendToRule(UnicodeString& rule,
                                UChar32 c,
                                UBool isLiteral,
                                UBool escapeUnprintable,
                                UnicodeString& quoteBuf) {
     // If we are escaping unprintables, then escape them outside
     // quotes.  \u and \U are not recognized within quotes.  The same
     // logic applies to literals, but literals are never escaped.
     if (isLiteral ||
         (escapeUnprintable && ICU_Utility::isUnprintable(c))) {
         if (quoteBuf.length() > 0) {
             // We prefer backslash APOSTROPHE to double APOSTROPHE
             // (more readable, less similar to ") so if there are
             // double APOSTROPHEs at the ends, we pull them outside
             // of the quote.
             // If the first thing in the quoteBuf is APOSTROPHE
             // (doubled) then pull it out.
             while (quoteBuf.length() >= 2 &&
                    quoteBuf.charAt(0) == APOSTROPHE &&
                    quoteBuf.charAt(1) == APOSTROPHE) {
                 rule.append(BACKSLASH).append(APOSTROPHE);
                 quoteBuf.remove(0, 2);
             }
             // If the last thing in the quoteBuf is APOSTROPHE
             // (doubled) then remove and count it and add it after.
             int32_t trailingCount = 0;
             while (quoteBuf.length() >= 2 &&
                    quoteBuf.charAt(quoteBuf.length()-2) == APOSTROPHE &&
                    quoteBuf.charAt(quoteBuf.length()-1) == APOSTROPHE) {
                 quoteBuf.truncate(quoteBuf.length()-2);
                 ++trailingCount;
             }
             if (quoteBuf.length() > 0) {
                 rule.append(APOSTROPHE);
                 rule.append(quoteBuf);
                 rule.append(APOSTROPHE);
                 quoteBuf.truncate(0);
             }
             while (trailingCount-- > 0) {
                 rule.append(BACKSLASH).append(APOSTROPHE);
             }
         }
         if (c != (UChar32)-1) {
             /* Since spaces are ignored during parsing, they are
              * emitted only for readability.  We emit one here
              * only if there isn't already one at the end of the
              * rule.
              */
             if (c == SPACE) {
                 int32_t len = rule.length();
                 if (len > 0 && rule.charAt(len-1) != c) {
                     rule.append(c);
                 }
             } else if (!escapeUnprintable || !ICU_Utility::escapeUnprintable(rule, c)) {
                 rule.append(c);
             }
         }
     }
     // Escape ' and '\' and don't begin a quote just for them
     else if (quoteBuf.length() == 0 &&
              (c == APOSTROPHE || c == BACKSLASH)) {
         rule.append(BACKSLASH);
         rule.append(c);
     }
     // Specials (printable ascii that isn't [0-9a-zA-Z]) and
     // whitespace need quoting.  Also append stuff to quotes if we are
     // building up a quoted substring already.
     else if (quoteBuf.length() > 0 ||
              (c >= 0x0021 && c <= 0x007E &&
               !((c >= 0x0030/*'0'*/ && c <= 0x0039/*'9'*/) ||
                 (c >= 0x0041/*'A'*/ && c <= 0x005A/*'Z'*/) ||
                 (c >= 0x0061/*'a'*/ && c <= 0x007A/*'z'*/))) ||
              PatternProps::isWhiteSpace(c)) {
         quoteBuf.append(c);
         // Double ' within a quote
         if (c == APOSTROPHE) {
             quoteBuf.append(c);
         }
     }
     // Otherwise just append
     else {
         rule.append(c);
     }
 }
 void ICU_Utility::appendToRule(UnicodeString& rule,
                                const UnicodeString& text,
                                UBool isLiteral,
                                UBool escapeUnprintable,
                                UnicodeString& quoteBuf) {
     for (int32_t i=0; i<text.length(); ++i) {
         appendToRule(rule, text[i], isLiteral, escapeUnprintable, quoteBuf);
     }
 }
 /**
  * Given a matcher reference, which may be null, append its
  * pattern as a literal to the given rule.
  */
 void ICU_Utility::appendToRule(UnicodeString& rule,
                                const UnicodeMatcher* matcher,
                                UBool escapeUnprintable,
                                UnicodeString& quoteBuf) {
     if (matcher != NULL) {
         UnicodeString pat;
         appendToRule(rule, matcher->toPattern(pat, escapeUnprintable),
                      TRUE, escapeUnprintable, quoteBuf);
     }
 }
 U_NAMESPACE_END

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intl/icu/source/common/util.cpp@fc2d59ddac77 (annotated)

intl/icu/source/common/util.cpp